const commands = require('./commands.js');
const TextEncoder = require('../utils/lib/text-encoding').TextEncoder;
const wximage = require('../utils/lib/wxImg');
const printerJobs = function () {
    this._queue = Array.from(commands.HARDWARE.HW_INIT);
    this._encoder = new TextEncoder('gb2312', {
        NONSTANDARD_allowLegacyEncoding: true
    });
    this._enqueue = function (cmd) {
        this._queue.push.apply(this._queue, cmd);
    };
};

/**
 * 增加打印内容
 * @param  {string} content  文字内容
 */
printerJobs.prototype.text = function (content) {
    if (content) {
        let uint8Array = this._encoder.encode(content);
        let encoded = Array.from(uint8Array);
        this._enqueue(encoded);
    }
    return this;
};

/**
 * 打印文字
 * @param  {string} content  文字内容
 */
printerJobs.prototype.print = function (content) {
    this.text(content);
    this._enqueue(commands.LF);
    return this;
};

/**
 * 打印文字并换行
 * @param  {string}  content  文字内容
 */
printerJobs.prototype.println = function (content = '') {
    return this.print(content + commands.EOL);
};

/**
 * 打印条形码
 * @param {string} content 条形码内容
 */
printerJobs.prototype.printBar = function (content = '') {
    this._enqueue(commands.BARCODE_FORMAT.BARCODE_WIDTH_DEFAULT);
    this._enqueue(commands.BARCODE_FORMAT.BARCODE_HEIGHT_DEFAULT);
    this._enqueue(commands.BARCODE_FORMAT.BARCODE_CODE128);
    this._enqueue(commands.LF);
    this._enqueue(commands.BARCODE_FORMAT.BARCODE_CODEA);
    this.text(content);
    return this;
};

/**
 * 设置条码内容显示在条码的哪个位置,默认不显示
 * @param {string} align 显示位置 OFF/ABV/BLW/BTH
 */
printerJobs.prototype.setHRIBarcodeChars = function (align = 'OFF') {
    this._enqueue(commands.BARCODE_FORMAT['BARCODE_TXT_' + align.toUpperCase()]);
    return this;
};

/**
 * 打印二维码
 * @param {Object} content 画布的参数
 */
printerJobs.prototype.printQrcode = function (res) {
    //参数，画布的参数
    let imgs = new wximage();
    this._enqueue(commands.GSV0_FORMAT.GSV0_NORMAL);
    let img = imgs.overwriteImageData(res);
    let width = res.width;
    let hight = res.height;
    let xL = parseInt((width / 8) % 256);
    let xH = width / 8 / 256; // 取整
    let yL = parseInt(hight % 256);
    let yH = hight / 256; // 取整
    this._enqueue([xL, xH, yL, yH]); //xL xH yL yH
    this._enqueue(img.array);
    return this;
};

/**
 * 设置对齐方式
 * @param {string} align 对齐方式 LT/CT/RT
 */
printerJobs.prototype.setAlign = function (align) {
    this._enqueue(commands.TEXT_FORMAT['TXT_ALIGN_' + align.toUpperCase()]);
    return this;
};

/**
 * 设置字体
 * @param  {string} family A/B/C
 */
printerJobs.prototype.setFont = function (family) {
    this._enqueue(commands.TEXT_FORMAT['TXT_FONT_' + family.toUpperCase()]);
    return this;
};

/**
 * 设定字体尺寸
 * @param  {number} width 字体宽度 1~2
 * @param  {number} height 字体高度 1~2
 */
printerJobs.prototype.setSize = function (width, height) {
    if (2 >= width && 2 >= height) {
        this._enqueue(commands.TEXT_FORMAT.TXT_NORMAL);
        if (2 === width && 2 === height) {
            this._enqueue(commands.TEXT_FORMAT.TXT_4SQUARE);
        } else if (1 === width && 2 === height) {
            this._enqueue(commands.TEXT_FORMAT.TXT_2HEIGHT);
        } else if (2 === width && 1 === height) {
            this._enqueue(commands.TEXT_FORMAT.TXT_2WIDTH);
        }
    }
    return this;
};

/**
 * 设定字体是否加粗
 * @param  {boolean} bold
 */
printerJobs.prototype.setBold = function (bold) {
    if (typeof bold !== 'boolean') {
        bold = true;
    }
    this._enqueue(bold ? commands.TEXT_FORMAT.TXT_BOLD_ON : commands.TEXT_FORMAT.TXT_BOLD_OFF);
    return this;
};

/**
 * 设定是否开启下划线
 * @param  {boolean} underline
 */
printerJobs.prototype.setUnderline = function (underline) {
    if (typeof underline !== 'boolean') {
        underline = true;
    }
    this._enqueue(underline ? commands.TEXT_FORMAT.TXT_UNDERL_ON : commands.TEXT_FORMAT.TXT_UNDERL_OFF);
    return this;
};

/**
 * 设置行间距为 n 点行,默认值行间距是 30 点
 * @param {number} n 0≤n≤255
 */
printerJobs.prototype.setLineSpacing = function (n) {
    if (n === undefined || n === null) {
        this._enqueue(commands.LINE_SPACING.LS_DEFAULT);
    } else {
        this._enqueue(commands.LINE_SPACING.LS_SET);
        this._enqueue([n]);
    }
    return this;
};

/**
 * 打印空行
 * @param {number} n
 */
printerJobs.prototype.lineFeed = function (n = 1) {
    return this.print(new Array(n).fill(commands.EOL).join(''));
};

/**
 *  设置字体颜色，需要打印机支持
 *  @param  {number} color - 0 默认颜色黑色 1 红色
 */
printerJobs.prototype.setColor = function (color) {
    this._enqueue(commands.COLOR[color === 1 ? 1 : 0]);
    return this;
};

/**
 * 蜂鸣警报，需要打印机支持
 * @param  {number} n    蜂鸣次数,1-9
 * @param  {number} t 蜂鸣长短,1-9
 */
printerJobs.prototype.beep = function (n, t) {
    this._enqueue(commands.BEEP);
    this._enqueue([n, t]);
    return this;
};

/**
 * 清空任务
 */
printerJobs.prototype.clear = function () {
    this._queue = Array.from(commands.HARDWARE.HW_INIT);
    return this;
};

/**
 * 返回ArrayBuffer
 */
printerJobs.prototype.buffer = function () {
    return new Uint8Array(this._queue).buffer;
};
module.exports = printerJobs;
